Set (someone or something) off phrasal verb
To anger someone
James sets me off every time he forgets to take out the trash.
To cause someone begin talking about something at length
It sets Kim off when it comes to history.
To cause something to explode
The fireworks are usually set off on New Year's Eve.
To cause something to occur or activate
The Covid-19 pandemic has set a global crisis off.
The smoke from his cigarette set off the sprinkler system.
To make something distinct or attractive
This shirt really sets your skin color off.
To reduce something, especially the cost of something
The state has decided to reduce taxes for businesses to set off their financial burden.
To start working on something seriously or determinedly; to start doing what needs to be done
To make something beginning or happenning, especially an acitivity, event or a series of events
It's time for something to start.
The verb "set" should be conjugated according to its tense.
To be very wet
Because of forgetting bringing an umbrella, I look like a drowned rat when it rains.